Circumventing brittleness of 3D-printed Al2O3 cellular ceramic structures via compositing with polyurea

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

1 Scopus Citations
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Author(s)

  • Xue-Qin Zhang
  • Ru-Yue Su
  • Xiong Gao
  • Jing-Yi Chen
  • Ru-Jie He
  • Ying Li

Related Research Unit(s)

Detail(s)

Original languageEnglish
Journal / PublicationRare Metals
Online published28 Jun 2024
Publication statusOnline published - 28 Jun 2024

Abstract

Benefiting from excellent mechanical properties and low density, cellular ceramic structures (CCSs) are competitive candidates as structural components. However, inherent brittleness from strong chemical bonds among atoms extremely impeded CCSs’ application. Natural materials occupied outstanding strength and toughness simultaneously due to the dual-phase interpenetrated structure. Inspired by natural materials, it was proposed to fabricate coating covered and fulfilled polyurea/CCS interpenetrated composites (C/CCSs and B/CCSs) to circumvent the brittleness of 3D-printed Al2O3 CCSs. It was demonstrated that polyurea coating had less effect on the compressive strength of C/CCSs but tremendously improved their energy-absorbing ability. The energy-absorbing ability of C/CCSs was improved from 26.48–52.57 kJ·m−3 of CCSs to 1.04–1.89 MJ·m−3 because of the extended plateau stage. Furthermore, compressive strength and energy-absorbing ability of B/CCSs were strengthened to 1.33–1.36 and 2.84–4.61 times of C/CCSs, respectively. Besides, failure mode of C/CCSs changed from localized deformation to fracturing entirely with the increase in relative density of CCSs inside, which was the same as that of CCSs. However, with the help of polyurea coating, C/CCSs were still intact at strains up to 60%, which would never fail catastrophically as CCSs at low strains. B/CCSs tended to fracture as a whole, which was not influenced by relative density of pristine CCSs. It was believed that this work provided a creative way to circumvent the brittleness of CCSs and improve their mechanical performances. © Youke Publishing Co.,Ltd 2024.

Research Area(s)

  • 3D printing, Cellular ceramic structures, Compressive strength, Dual-phase interpenetrated composites, Energy-absorbing ability

Citation Format(s)

Circumventing brittleness of 3D-printed Al2O3 cellular ceramic structures via compositing with polyurea. / Zhang, Xue-Qin; Su, Ru-Yue; Gao, Xiong et al.
In: Rare Metals, 28.06.2024.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review